| COMCAST 1816276 · TMA1031073 | Comcast Corporation | 38 Telecommunications41 Education | Registered | 2019 |
| COMCAST 1816271 · TMA1011311 | Comcast Corporation | 9 Electronics35 Advertising38 Telecommunications+2 | Registered | 2018 |
| COMCAST 1813330 · TMA1011313 | Comcast Corporation | 37 Construction38 Telecommunications41 Education | Registered | 2018 |
| COMCAST 1362798 · TMA730645 | Comcast Corporation | 38 Telecommunications41 Education | Registered | 2008 |
| COMCAST 0713442 · TMA433365 | COMALCO ALUMINIUM LIMITED | 19 Building | Registered | 1994 |
| CamCasle 2186929 · TMA1234584 | shenzhen feiyan huanqiu E-Commerce Co.Ltd | 9 Electronics | Registered | 2024 |
| CONCISE 1867843 · TMA1057758 | Fine Agrochemicals Limited, CORPORATION UNITED KINGDOM | 1 Chemicals | Registered | 2019 |
| CAMOCAST 1718348 · TMA992858 | JOSTENS, INC. | 14 Jewellery | Registered | 2018 |
| COINCASA 1430710 · TMA841848 · design | an individual | 8 Hand11 Lighting16 Paper+7 | Registered | 2013 |
| CONCISE 1009999 · TMA574912 | Hair Club for Men, Ltd., Inc. | 3 Cosmetics26 Sewing | Registered | 2003 |
| CONCAST 0886987 · TMA530257 | A Cubed Corporation (a Pennsylvania corporation) | 6 Metal | Registered | 2000 |
| CONACAST 0484906 · TMA281122 | CYTEC TECHNOLOGY CORP. | 6 Metal9 Electronics16 Paper | Registered | 1983 |
| CONCISE 0358701 · TMA197483 | 3M Company (a Delaware corporation) | 5 Pharmaceuticals | Registered | 1974 |
| CONCASSE 2288106 | an individual | 11 Lighting21 Housewares | Pending | 2023 |
| CINECAST 2042069 | an individual | 9 Electronics41 Education42 Science | Pending | 2020 |
| CANNACASE 2094791 · TMA1172511 | an individual | 34 Tobacco | Registered | 2023 |
| ComMusicate 1966822 · TMA1244664 | an individual | 9 Electronics | Registered | 2024 |
| CHANGESELF 2249917 · TMA1268795 · design | Changeself Technology (Shenzhen) Co. Ltd. | 9 Electronics35 Advertising42 Science | Registered | 2024 |
| CONNEXIS 2224211 · TMA1241887 | Phoenix Contact GmbH & Co. KG | 9 Electronics | Registered | 2024 |
| CamCoach 2167327 · TMA1200535 | Spireon, Inc. | 9 Electronics | Registered | 2023 |
| COMSIGN 2141270 · TMA1206204 | ComSign Ltd. | 42 Science | Registered | 2023 |
| cannookies 2123446 · TMA1186589 | an individual | 30 Coffee | Registered | 2023 |
| CAMZYOS 2117717 · TMA1193613 · design | MyoKardia, Inc. | 5 Pharmaceuticals | Registered | 2023 |
| Cimkiz 2112345 · TMA1269193 | Shenzhen Cimkiz Technology Co. Ltd. | 6 Metal20 Furniture28 Toys | Registered | 2024 |
| CANNASUCRES 2086849 · TMA1107884 | ROSE LIFESCIENCE INC. | 30 Coffee32 Beer | Registered | 2021 |